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Terminate the program
#include <stdlib.h>
void _exit( int status );
- status
- The exit status to use for the program. The value may be zero, EXIT_STATUS,
EXIT_FAILURE or any other value. Note that only
the least significant bits (i.e. status and 0377) may be
available to a waiting parent process.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The _exit() function causes normal program termination to occur.
|
The functions registered with
atexit()
aren't called when you use _exit() to terminate a program.
If you want those functions to be called, use
exit()
instead. |
The _exit() function does the following when a process terminates for any
reason:
- Closes all open file descriptors and directory streams in the calling
process.
- Notifies the parent process of the calling process if the
parent called
wait() or
waitpid().
The low-order 8 bits of status are made available to the
parent via wait() or waitpid().
- Saves the exit status if the parent process of the
calling process isn't executing a wait() or
waitpid() function. If the parent calls wait()
or waitpid() later, this status is returned immediately.
- Sends a SIGHUP signal to the calling process's
children; this can indirectly cause the children to exit if they
don't handle SIGHUP.
Children of a terminated process are assigned a new parent
process.
- Sends a SIGCHLD signal to the parent process.
- Sends a SIGHUP signal to each process in the
foreground process group if the calling process is the controlling
process for the controlling terminal of that process group.
- Disassociates the controlling terminal from the calling process's
session if the process is a controlling process,
allowing it to be acquired by a new controlling process.
- If the process exiting causes a process group to become orphaned, and if any member
of the newly-orphaned process group is stopped, then a
SIGHUP signal followed by a SIGCONT
signal is sent to each process in the newly-orphaned process group.
The _exit() function doesn't return.
#include <stdio.h>
#include <stdlib.h>
int main( int argc, char *argv[] )
{
FILE *fp;
if( argc <= 1 ) {
fprintf( stderr, "Missing argument\n" );
exit( EXIT_FAILURE );
}
fp = fopen( argv[1], "r" );
if( fp == NULL ) {
fprintf( stderr, "Unable to open '%s'\n", argv[1] );
_exit( EXIT_FAILURE );
}
fclose( fp );
/*
At this point, calling _exit() is the same as calling
return EXIT_SUCCESS;...
*/
_exit( EXIT_SUCCESS );
}
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
abort(),
atexit(),
close(),
execl(),
execle(),
execlp(),
execlpe(),
execv(),
execve(),
execvp(),
execvpe(),
exit(),
getenv(),
main(),
putenv(),
sigaction(),
signal(),
spawn(),
spawnl(),
spawnle(),
spawnlp(),
spawnlpe(),
spawnp(),
spawnv(),
spawnve(),
spawnvp(),
spawnvpe(),
system(),
wait(),
waitpid()
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